Death Mask of Cacus, Berserker

The Valkyrie of the Grey dons The Death Mask of Cacus, she transforms into a gigantic unstoppable berserker.

Enters with x/x, {x} equals the total p/t of all affiliates of The Legion or Valkyries in your battlefield.

When attacked, she’ll rampage through her attacker’s battlefield, causing them damage as they damage her.
Place a -1/-1 on each remaining creature in the attacker’s battlefield, totalling the damage The Berserker received.